Air-feeding device



S. H. SANBORN.

AIR FEEDING DEVICE. APPLICATION flu-:D DEc.26, |918.

1124349228.. Patented; Oct. 3L 11922.,

Patented 3l, i922..

,FATENT STEPHEN E'. SANBORN, OIF NEW HAMPTON, NEX/V YORK.

AIE-FEEDNG DEVICE.

Application led December 26, 1918.

To c//ZZ w hom 'it may concern:

Be it known that l, STEPHEN H. SANBonN, a citizen of the `United States, residing at New Hampton, Orange County, New York, have invented certain new and useful lmprovements in Air-Feeding Devices, consisting of devices adapted. to supply air through the gra-tes and repots of hea-ting apparatus, such as furnaces, heaters, and kindred structures; and I do hereby declare that the following isafull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings and to the characters of reference marked thereon.

r-ls furnaces, heaters and similar structures for producing heat by the combustion of coal and other materials have been heretofore constructed, they are provided with a repot and an ash pit beneath the same, and the chamber containing these is generally closed by one or more doors, provided with openings for the admission of air beneath the grate in order to replace the air which, as it is heated by the fire, passes off through the smoke pipe and up the chimney creating a draft. The result of this is that the air needed to replace that which passes off with the smoke is drawn from the place where the heating device is located, either a living room, kitchen, cellar or other room, and this air is drawn through the doors, windows, or other openings in. such locations, creating a draft towards and through such grate, making the location drafty, causing discomforts and colds, etc., when plenty of air can be thus obtained, or when sufficient air cannot be thus obtained, rendering it difficult to obtain satisfactory ignition for the combustion of the fuel.

The object of this invention is to furnish improved methods and devices for creating a draft in such heating apparatus, whereby the fuel used may be more thoroughly and completely consumed, and whereby a suction or syphon-like current of air may be forced or driven through the materials of combustion to accomplish t-he purpose iudcated, without d 'awing the same directly Serial No. 26,277.

through the place where the heating appara tus is located. I

g My invention may be applied wherever a draft is required in heating structures, and it is illustrated here for domestic heating and otherl purposes, but without any inten tion of limiting 4the same to such applications.

In the drawings Figure 1 is a front elevation, partly in section, of a furnace of usual construction, having the improvements of this invention applied thereto.

Figure 2 is a horizontal section through the lower portion of the same, taken on the line 2-2 of Figure l.

Figure 3 is a fragmentary enlarged vertical section through the furnace with the improvement applied thereto taken on the line 3 3 of Figure 2.

Figure 4t is a. fragmentary enlarged sectional view of a modified detail.

Similarl characters of reference indicate like parts in all the drawings.

lVhen my invention is to be applied to a heater already constructed, as shown in Figure l, the door leading to the firepot of the same may be removed, if necessary, and a door as D applied in the place of the same.

In Figure l, A is the case of an ordinary hot air furnace, provided with a door B to the heated air chamber of the same; C is a door through which the fuel is to be inserted; D is a hinged door opening from vthe chamber of the grate and ash pit; Fi is an ordinary sheet iron smoke pipe of a size suflicient to convey the products of combustiou from the fire pot to the chimney F, from which the same pass to the outer air; a

a draft introducing pipe which is to extend some 8 or 10 feet above the top of the chimney through which the products of combustion are ldischarged from the smoke pipe E. in the example of my invention illustrated as applied to the hot air furnace A, the draft pipe t is shown terminating in two branches, b, 0,' t-he branch Z9, which is to be firmly attached to the furnace case A in any convenient manner, leading toward the furnace door l), and the branch c leading into the cold air box G. Euch of these branches and c is provided with a damper d. The lower end of the branch b of the draft pipe a terminates just short of the hinged door D so as to permit that door to be opened on its hinges in orderl to rake the grate or to remove the ashes. In the hinged door D a short arm pipe c of the same dimensions as the pipe Z) is secured, and a sleeve f, with a thumb screw g, is provided to slide over the ends of the pipes l) and e to connect them when the door D is closed and the draft is to be introduced, and to permit the sleeve j' to be slid out of the way so that the door D may be opened.

lVhen the draft is to be applied to the grate of the furnace il, and the fire started, the damper /Z in the branch of the pipe a, shown in Figure l, is to be opened. and the damper Z in the branch c of the pipe t is to be closed, so as to apply the full force of draft passing down through the draftpipe c bv the pressure downward of vcold air in that pipe rushing to supply the current created in the fire pot of the furnace by the discharge of the heated air carrying the products of combustion through the smoke pipe .E and the chimney F. In other words, it has been discovered that in cold weather, or in cold climates', the cold air from above the roof of a building' will descend through the tube in the smoke pipe and supply the necessary fresh air under the grate in the fire pot of a furnace or other heater, thereby avoiding the draft which is always incident to drawino this air into the ash pit through openings in the door of the ash pit.

After the fire has been thoroughly started and sufficient heat produced, the damper CZ in the branch t may be closed, or partly closed, and the damper d in the branch c opened, to aid in driving air to be heated down into the cold air box G, and by opening or closing the dampers in the branches ZJ, c, the combustion may be retarded or urged. as desired.

In Figure 2, which is an enlarged det-ail, on the line 2, 2, of Figure l., the parts are shown clearly, and the edge of the door D is shown provided with a strip 71 of asbestos felt, to aid in making a tight closure so as to exclude any draft not coming through the draft pipe fr. The hooked handle in the door D is also clearly shown in Figure 2.

Any suitable means may be employed for holding the draft pipe ai, in the chimney F.

In situations where the branch Z) of the draft pipe c can be more conveniently or cheaply connected with the ash pit of the furnace or heater at some pointother than through the door of the same, it may be connected therewith at such other point.

In case it should be found that the linsertion of the draft pipe t into the smoke pipe E of the heating structure interferes with the free discharge of the products of combust-ion through the same into the chimney lf, a larger smoke pipe E as shown in Figure et, may be supplied from the point where the draft pipe fr. enters the smoke pipe.

The resilient reproof lining 71 for the door to the fire pot chamber is of advantage both in excluding` or diminishing draft current through the apartment where the structure is' situated and in maintaining a stronger draft current from the outer air, and they are especially necessary when the parts of the heating device become distorted by wear or heat.

By the application of my invention it will he possible to start the fires more quickly and to 'economize in the use of fuel, for by 'increasing the draft the combustion of fuel canbe made more complete than when the air has to be drawn into the heater through cracks' or ill-closed portions of a room or other location.

While I have shown thedraft construction of my invention applied by means of a draft pipe inserted in a chimney or smoke stack, I desire it to be understood that in building chimneys and smoke stacks which are to be provided with the draft conveying means of my invention such draft conveying` means are not to be limited to pipes inserted in chimneys or smoke stacks, but that my inventien may also be utilized by constructing a draft conveying tube or pipe directly in or as a part of the chimney itself.

Of course it will be understood that the invention as above set forth in connection with a furnace or heater may be applied to various ty es of heating devices wherein the feeding o i air beneath the grate or into the ash pit is desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is:

l. In a heating structure provided with a body part having a. cold air box and an ash pit, and the usual smoke pipe, an air feeding` pipe extending through the smoke pipe and having a lower end branched with one branch in con'imunication 'with the ash pit, and the other branch in communication with the cold air box.

2. In combination with a het air heater provided with the usual smoke pipe, cold air box and ash pit, an air feeding pipe arranged within said smoke pipe and havingbranches at its lower end, one of; said branches being adapted to open into the cold air boi; and the other branch being adapted to communicate with the ash pit.

3. In combination with an air heating device having the usual smoke pipe, air box and ash pit, an air lfeeding' pipe extending through the smoke pipe and chimney to above the chimney top, having branches at its lower end, means for connecting one of J@he branches to the air box, and means oonneoting the other branch to said ash pit.

4. In combination with an air heater hav ing the usual smoke pipe, cold air box and municating with the ash pit, and damper-s arranged in said branches for independently controlling the passage of air downwardly through said air supply pipe into the ash pit and the air box.

STEPHEN H. SANBORN. Witnesses:

FRE-D. V. DELAVINA, JAMEs J. HOURAHAN. 

